Ping remote sever, nc, telnet, whatever


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
Operating Systems BSD Ping remote sever, nc, telnet, whatever
# 1  
Ping remote sever, nc, telnet, whatever

I put this thread to shell and bsd, because I want to resolve this matter on bsd.
May somebody can explain to me how to ping a remote server, in unix. BTW the following code examples were tried on a linux system as well, with the same output, nothing. But on my bsd are not installed nmap neither netcat.
Furthermore there are more than one high anonymous or just anonymous servers, this is just one.

I tried so far the following commands (on linux)

Code:
nc -v -w 1 133.242.225.54 -z 80

output

Code:
133.242.225.54: inverse host lookup failed: Unknown host
(UNKNOWN) [133.242.225.54] 80 (http) : Connection timed out

Another example with telnet (on linux)
Code:
telnet 133.242.225.54/80

output (quote) no typing error:
Code:
telnet: could not resolve 133.242.225.54/80/telnet: Name or service not known

without the port
Code:
telnet 133.242.225.54
Trying 133.242.225.54...
telnet: Unable to connect to remote host: Connection timed out

and as well ping as follows
Code:
ping -c1 -w3 133.242.225.54
PING 133.242.225.54 (133.242.225.54) 56(84) bytes of data.

output

Code:
--- 133.242.225.54 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2000ms

Does this mean the remote server is up? At least ping sent three packets, zero loss. But is it on air?
I am aware there are tries with the destination port and tries without it. If someone could give me a hint I really could go on. Thanks in advance.
# 2  
If you are looking to see if something is listening on port 80, you were close with telnet.
Code:
telnet <ip> <port> # not <ip>/<port>

Without the port, telnet will try the default telnet port (port 23).
On most modern unix system telnet is disabled due to security reasons (plain text over network, no encryption etc.), in turn you got (which means telnet is not active on the remote server) :
Code:
telnet: Unable to connect to remote host: Connection timed out

Ping will tell you that the server is alive and responding to ICMP requests.
ICMP is also quite often blocked on firewalls, due to ICMP flooding exploits and alike.

Hope that clears things out.
Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
# 3  
Its getting clearer, but I (as a user) want to connect to a high anonymous or an anonymous remote server (lets say as a proxy). Which mostly use (any of them) port 80, port 8080 or 3021, so even with a firewall installed there, a simple ping should work. It's not about ssh on port 22 or vpn. Before connecting, I want to here a positive response, server on air. Thats my intention.
# 4  
Ping against server will work if firewall allows ICMP probes.

If a server service is listening on port N, a simple telnet IP port will tell you that.
Something like :
Code:
:~$ telnet www.unix.com 80
Trying 4.59.125.171...
Connected to www.unix.com.
Escape character is '^]'.

This tells me that 4.59.125.171 has a port 80 open are receiving requests.

For further (security Smilie) analysis nmap is the best tool.
Port Scanning is Not a Crime but acting on its results can be, especially on government and financial sites.

Regards
Peasant.
# 5  
Quote:
Originally Posted by 1in10
.
.
.
Code:
ping -c1 -w3 133.242.225.54
PING 133.242.225.54 (133.242.225.54) 56(84) bytes of data.

output

Code:
--- 133.242.225.54 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2000ms

Does this mean the remote server is up? At least ping sent three packets, zero loss. But is it on air?
.
.
.
ping transmitted three packets but didn't receive any: 100% packet loss, not zero!
It doesn't seem to be "on air" unless those packets are intercepted by some firewall.
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

ping and telnet timeout

Hello, I need help, I have the following which save in the result file ping and telnet:port test. Basically the script works but I should implement a check on ping and telnet command so that ping has 5 seconds threshold and telnet (more important) 10 seconds. Over that threshold ping and... (0 Replies)
Discussion started by: marmellata
0 Replies

2. UNIX for Dummies Questions & Answers

ping,telnet, traceroute

can you provide the command in solaris8 if I wanted to ping,telnet, traceroute an IP address with a port? thanks (1 Reply)
Discussion started by: lhareigh890
1 Replies

3. AIX

ping OK - telnet refused

Hi, After a crash of our older AIX server it happend as it is in the title: ping is ok, but telnet: What it can be this strange thing? Franci (2 Replies)
Discussion started by: frajer
2 Replies

4. UNIX for Advanced & Expert Users

ping and telnet - HP-UX

Hi all, I am not sure if my problem is specific to HP-UX or not. Hopefully someone can tell me what's wrong. I have a server name server1 10.100.50.10 in the /etc/hosts file and if I do a ping server1, it shows the right IP address. However, if I run telnet server1, it is not using... (4 Replies)
Discussion started by: newbie_01
4 Replies

5. Infrastructure Monitoring

no telnet, ping ok...

We have a Sun Solaris Netra 20 server. Our O&M Server gets Alarm Processor not responding. When Alarm occurs, you can ping the sun server but cannot telnet it. We keep getting Interrupt level not serviced. var/adm/message log is > tail -f messages Apr 12 20:09:56 cama pcisch: PCI-device:... (9 Replies)
Discussion started by: krabu
9 Replies

6. Shell Programming and Scripting

Run command on remote sever from script

I have two redhat linux server. i have created one script which contain some command that run on Local server as well as remote server.I am using this command to connect to remote server ssh user1@192.x.x.x 'command' but when i am running the script in local server it connecting to the server... (1 Reply)
Discussion started by: ranvijaidba
1 Replies

7. IP Networking

can ping but can not telnet UNIX

I have one problem and it is giving me hard time I can ping my windows machine root@x1ChXpress:/sbin >ping 192.168.129.66 192.168.129.66 is alive root@x1ChXpress:/sbin >netstat -rn Routing Table: Destination Gateway Flags Ref Use Interface... (3 Replies)
Discussion started by: amon
3 Replies

8. AIX

Ping/Telnet is not happening

Hi All, We are not able to ping to a AIX box...Network is ok..when we give ping from that AIX box..it is giving 0821-067 ping: The socket creation call failed.there is no enough buffer space for the requested socket operation. refresh -s inetd is also giving socket error. Please help to... (1 Reply)
Discussion started by: b_manu78
1 Replies

9. SCO

Openserver 5.0.4 can't be ping or telnet into from a remote site

Hi, Can anybody help me out why l can't not ping my server with Openserver 5.0.4 with my windows machine from a remote site. The machine could see the local LAN with the Router however, i can't ping or telnet unto the server from another site on the WAN. The default gateway was configure on the... (0 Replies)
Discussion started by: kayode
0 Replies

10. IP Networking

ping and telnet

I can ping other computers in my office. I can telnet other users in my office but i cannot get out of the office network. If i try to go out side of my network it cannot find host. Any ideas? (5 Replies)
Discussion started by: macdonto
5 Replies

Featured Tech Videos